Jack Kilby and Robert Noyce

Integrated circuit

The integrated circuit emerged in two distinct forms: Kilby’s 1958 germanium prototype proved integration was possible but relied on external wires; Noyce’s 1959 silicon monolithic chip, built using the planar process and on-chip aluminium interconnects, enabled mass production. Modern ICs follow Noyce’s architecture — not Kilby’s — because scalability required eliminating manual wire bonding. The invention’s value lies not in its first demonstration, but in its first manufacturable form.